Degenerate Elliptic Equations - Mathematics and Its Applications - Serge Levendorskii - Books - Springer - 9789048142828 - December 15, 2010
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Degenerate Elliptic Equations - Mathematics and Its Applications 1st Ed. Softcover of Orig. Ed. 1993 edition

Serge Levendorskii

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Degenerate Elliptic Equations - Mathematics and Its Applications 1st Ed. Softcover of Orig. Ed. 1993 edition

0.1 The partial differential equation (1) (Au)(x) = L aa(x)(Dau)(x) = f(x) m lal9 is called elliptic on a set G, provided that the principal symbol a2m(X,?) = L aa(x)?a lal=2m of the operator A is invertible on G X (~n \ 0); A is called elliptic on G, too. This definition works for systems of equations, for classical pseudo differential operators ("pdo), and for operators on a manifold n. Let us recall some facts concerning elliptic operators. 1 If n is closed, then for any s E ~ , is Fredholm and the following a priori estimate holds (2) 1 2 Introduction If m > 0 and A : C=(O; C') -+ L (0; C') is formally self - adjoint 2 with respect to a smooth positive density, then the closure Ao of A is a self - adjoint operator with discrete spectrum and for the distribu­ tion functions of the positive and negative eigenvalues (counted with multiplicity) of Ao one has the following Weyl formula: as t -+ 00, (3) n 2m = t / II N±(1,a2m(x,e))dxde T·O\O (on the right hand side, N±(t,a2m(x,e))are the distribution functions of the matrix a2m(X,e) : C' -+ CU).


436 pages, biography

Media Books     Paperback Book   (Book with soft cover and glued back)
Released December 15, 2010
ISBN13 9789048142828
Publishers Springer
Pages 436
Dimensions 210 × 297 × 23 mm   ·   612 g
Language English  

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